Radiotelephonograph



J. B. BROWNING RADTO TELEPHONOGRAi'H 'Jan. 14, 1936.

Original Filed June26. 1922 r 2 Sheets-Shea?- 1 and Minnie Patented Jan.14, 1930 UNITED STATES PATENT. orrlca JOHN B. BROWNING, F CAMDEN, NEWJERSEY nainornnnrnonoomn Original application filed June 26, i922,Serial No. 570,906. Divided and this application filedl'ebruary 25,1927. Serial No. 170,794.

An object of this invention is to embody into a unitary system the mostdesirable reproducing characteristics of both the graphic and radioarts.

Another object is to combine into a portable device, radio receiving andtransmitting circuits, sound re roducing and recording means with or without a mechanical amplifier for audible sound waves.

A further object is to provide in such a device a radio antenna orpick-up so arranged in relation to the other elements that it maybedirectionally positioned with respect to the sound outlet of the cabinetwithout changing the position of any other element. T

Further objects as well as details of construction and operation arehereinafter fully brought out in the following description when read inconjunction with the accompanying drawing in which Figure l is avertical section of one embodiment of my invention, taken along line 1-1of Figure 3- Figure 2 is a horizontal section taken along line 2-2 ofFigure 3. c

Figure 3 is a side. View artly in section,

Fi re-4- is an enlarged plan view of the doub e goose neck carrying themechanical sound recorder or reproducer and the electrical receiver ortransmitter.

Figure 5 is an enlarged side view of the elements shown in Fi re 4.

In my preferred modification as shown in the drawing my invention ishoused Within a table cabinet 50, which may be replaced by any othertype of enclosure. The cabinet is provided with a plurality of resonancechambers as 52 and 56, positioned between.

the walls of the cabinet'and the walls of the mechanical amplifier. Eachof thefiresonance chambers .may. be subdivided into smaller'chambers 53,54, 57 and 58, within each of which ma be disposed various parts of thephonograp and the radio set without materially afiectin the resonance ofthe cabinet. Between e two chambers 52 and 56 and beneath the cover 60is-provided a central sound amplifying chamber 55- which 00 surroundsthe inneramplifier 'and 66.

phono The inner amplifier includes a hollow vibratory tapered portion65, which is carried by a hollow non-vibratory connection 66, whichcommunicates with a minor hollow tapered portion 4. A plurality ofmovconnections are arranged to swing in the.

same manner below the record. A substantially heavy portion 66 iscarried at the rear of 66 to counterbalance the weight of 4 and itsconnections.

The extending connections 164, 164, 71, 72 and 73. are arranged tocommunicate with the receivers 165, 166 or a loud speaker 168, either ofwhich may have different tonal characteristics and be interchanged, themechanical or electrical sound recorder or reproducer 5 and 162 are alsointerchangeable.

It will be noted that 4 and 65 with their connections form acontinuously curving tapering sound amplifier of continuousl increasingcrossv section avoiding all s arp turns, thus giving all the efiiciencyof a large cumbersome straight horn. Not only is this arrangement of aspecial advantage when used in connection with the phonograph, butisalso of a eat advantage when used in cooperation with the radio set.

' Arranged across one end of the. chamber 55 are a plurality ofdeflectors 75 which may be adjusted to deflect the sound upward ordownward and also arranged at the delivery openings of this chamber aredoors 77, 78, 79 and 80which'may be adjusted to modify the qualityot thereproduction at will on either side of the cabinet.

Doors 82, 82, 83 and 83' are also provided for the chambers 52 to 53,54, 56, 57 and 58.-

The dividing Walls and 91 arranged f between the chambers 52 and 56 aresemitransparent or conductive to sound fibre.-

tion, which may be varied, includes a square frame 85, with four crosspieces 86 one at each corner, around which is wound, the antenna wire87, the desired number of turns. The frame is also provided with a pivot88 which fits into a socket bearing 88 J in the panel or motor board 92,permitting the antenna as a unit to swing freely through the openings 93and 94 provided in the panel or motor board and around the motorcompartment 95 and the sound amplifier and 66.

The motor for the support shaft 7 is mounted in the compartment whichmay be arranged in any convenient position beneath the panel 92 withinthe chamber 55.

The yoke 68, on which is mounted the ortion 66, is provided with twolateral arms O which are provided with pivots at the end of each armwhich fit into bearings arranged in the ball portion 63 of 66, whichpermits vertical movement of 4:, 65 and their connections, lateralmovement beingprovided by the pivot 69 of 68, which fits into the pivotbearing 69, and then support 68 is mounted in a well known mafiifrer inthe chamber 55.

The ball portion 63 of 66 is arranged to work in a socket bearing 64secured to the panel 92.

The cover 60 is provided with a resonant chamber 61 formed by apartition 61 within which may be arranged the elements of a radiocircuit including an antenna, which may be conveniently operated whenthe cover is raised.

Sound waves that are projected from the mechanical or electricalreproducer into the chamber 62 formed by the cover when closed will passthrough the openings 93 and 94 into the chamber 55 comingling with thesound delivered from 65.

. The antenna may be removed as a unit by raising the motor board 92 ina well known manner, removing the turntable 7 and lifting the antennathrough the top.

Arranged within the cabinet in a manner not to interfere with itsresonance is a radio telephone receiving circuit, the diagram of whichis shown in Fig. 2.

This hook up may be modified according to desire for either transmissionor reception or substituted for any other well known receiving ortransmitting circuit. It may be built up of a number of separate unitscom-- prisin separate stages of radio and audio ampli cation, and aseparate tunin and detector unit which may be arrange to meet thedifferent requirements. The hook up may include a battery as a source ofenergy or may be directly connected to the electric light circuit withproper means to make it suitable for the purpose.

In this diagram there is only one adjustment require to tune the set tothe proper wave length. This adjustment is accomplished by means of avariable condenser across the loop antenna and given a variationsuflicient to tune in any of the radiophone broadcasting stations thatmaybe heard.

An ordinaryswitch S controls the current of all the filament of thevacuum tubes used in the radio amplifier, as well as in the field of theloud talkers, which may be of any well known type. Consequently, oncethe condenser has been adjusted to receive the transmission from a radiobroadcasting station with maximum intensity, it is merely necessary toturn on the switch when the station is broadcasting or transmitting, to

bring in speech and the music that is being transmitted. This featuremakes it a very easily operated radio circuit.

In the radio amplifier are incor orated two stages of radio frequencyampli cation, which may be increased if desired, and-three stages ofaudio frequency amplification so as to operate the loud talkers withmaximum eflicienc In this diagram J represents a single clrcuit jack,for the connection of the loop-aerial to the set which is made by themeans of a plug. J" are double circuit jacks to cut in the several stepsof audio frequency amplification if it is desired to use the transmitter162, or'to plug in a pair of tele hone receivers for long distancereception. is a variable condenser shunting the loop aerial for thepurpose of tuning the circuit to the proper wave-length, vwhileL is thegrid leak and K the grid condenser, the capacity of which depends uponthe. type of vacuum tube detector used; .it is generally between 000%and .0005 microfarad. T represents the radio frequency transformers, andT the audio frequency transformers. V represents the vacuum tubes of theradio frequenc amplifier. V is the detector tube. V' t e amplifyingtubes of any make and V the 5 watt power tube upon the plate of which avery high voltage may be applied. R and R" are respectivel the rheostatsof the radio and audio amp ifying tubes and R the detector tube. Arepresents the A battery which should be of sufficient size to III III

supply all of the tubes and the field of the to 300 volts with the tapsfor the detector,

the radio amplifier and the two first audio amplifier tubes. The gridleaks shown across the secondary windings. of the audio frequencytransformers are necessa only if a high voltage is used. The radiofrequency transformers may be of the iron core type and should be sodesigned asto cover t e band of wave lengths it is desired to re ceive.If desired they may be of the air type and tuned with variablecondensers, and a potentiometer P should be used so as to control theoscillations of the two tubes.

The loud speakers 165, 166, 168 and 162 when used as a loud speaker maybe connected in series or series parallel and increased to any desirednumber, not shown in the diagram, should be connected between the plateof the last tube, and the positive of the B battery the field coil beingin parallel with the filaments of the tubes. The loud speaker 168 isshown mounted o'n the heavy non-vibratory portion 66 communicating withthe passage which leads to or 4. If it is desired, it may be placed on4.0r either of the small tubes and wired as desired.

Thus it is seen that I have provided a .device which .besides beingoperable as an ordinary phonograph or a radio receiving set can also beoperated in any of the following manners (a) To transmit radio andaudible sound impulses from a sound record. To do so the impulses may befirst produced by operative contact. of the reproducer 5 with the record6 and discharged into the sound passages 164 and 164: to the transmitter162; A variation consists in bringing the transmitter 162 in direct,contact with the record, in which case the groove variations in therecord are translated into electric impulses which are broadcastedthrough the radio set, and audible sound waves which are amplified anddelivered through the amplifying passages of the cabinet.

(6) To broadcast radio impulses while recording sound waves upon arecord tablet for possible future reproduction and broadcasting.- Inthis mode of operation, the

sound waves of the concert to-be broadcasted are phonographicallyrecorded in the usual manner by means of the reproducer 5. The soundwaves, while actuating the reproducer to make the record, pass throughthe sound passages of the cabinet to the transmitter 162 where they aretranslated into ultraaudio impulses to be broadcasted by the radio set.

(c) To record a radio program on a. record tablet while the concert isbeing listened to. The doors of the cabinet are adjusted to permit thedelivery of the sound from the amplifying chamber 55 and the recorder 5is horn.

- (d) To play a radio selection and a phonographic record of, the sameselection simultaneously, so that in case the radio fades out thedancing may be continued without interruption.

The subject matter of this application has been carved out of a parentapplication Serial Number 570,906 lned'June 26, 1922. Reference is alsomade to. the following applications, all of which have been carved outof the same parent case Application SerialNo. 169,306, filed Feb. 18,1927.

Application Serial No. 308,793, filed Oct. 2, 1928. I

Application Serial No. 23,569, filedApril 16, 1925.

Each one of these cases includin'gthe parent case has been drawn tocover a divisible feature of my invention.

What I claim is as follows:-

1. In a radio set, a stationary frame, a coil pivoted within said frameand means formounting a plurality of pieces of apparatus within thefigure generated by the revolution of said coil.

2. In a radio set, a stationary frame, a

loud speaker horn secured to one side of 'sa1d frame and extendingthcrewithin, and

a loop aerial pi'votally mounted'within said frame and adapted to berevolved about said horn.

3. In a radio set, a stationary cabinet, a loop aerial pivotally mountedwithin said cabinet, and means 'supported from said cabinet for mountinga plurality of .pieces of radio apparatus within the figure generatedbythe revolution of said aerialwithin said cabinet.

4. In a radio set, a stationary cabinet having'a fpivot member supportedfrom one of its sides, a loop aerial mounted within said cabinet havinga cooperatin pivot member pivotally engaging said rst mentioned pivotmember and apparatus mounting meanssecured to said first mentioned pivotmember and disposed within the figure generated by the revolution ofsaid aerial.

5. In a radio set, astationary frame, radio pickup means positioned insaid frame and a loud speaker pivoted to said frame and movable withrespect to said frame and said pickup means. 6. In a radio set, astationary frame, a coilplaced in contact with a rotating record

